Great Lakes Forecast
Issued by NWS
Issued by NWS
675 FZUS63 KMQT 220819 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 419 AM EDT Sat Jun 22 2024 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...High pressure of 30.0 inches over Lake Superior today will weaken to 29.9 inches later today and tonight as a 29.7 low pressure trough tracks northeast from Wisconsin into eastern Upper Michigan. As the low passes near the Straits of Mackinac Saturday night and reaches southern Quebec on Sunday, it will deepen to 29.5 inches. In its wake, 29.9 inch high pressure building into the Northern Plains on Sunday will settle over the western Great Lakes region on Monday and then the Appalachians on Tuesday. Back to the northwest, 29.3 inch low pressure over Manitoba Monday night will track east toward James Bay on Tuesday, pushing an associated 29.6 inch trough across Lake Superior through Tuesday night. 29.9 inch high pressure extends into the Upper Great Lakes Wednesday from the High Plains. LSZ162-221630- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 419 AM EDT Sat Jun 22 2024 /319 AM CDT Sat Jun 22 2024/ .EARLY THIS MORNING...Northeast winds 10 to 20 knots. A slight chance of showers. Waves calm to 2 feet. .TODAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A chance of showers. Waves building to 2 to 4 feet. .TONIGHT...Northeast winds 5 to 15 knots backing northwest after midnight, then backing west late. A slight chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. Patchy fog after midnight. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southwest after midnight. Showers likely and a chance of thunderstorms. Waves calm to 2 feet. .TUESDAY...Southwest winds 10 to 20 knots veering west. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-221630- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 419 AM EDT Sat Jun 22 2024 .EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots becoming northeast 10 to 20 knots in the afternoon. A chance of showers. Waves building to 2 to 4 feet. .TONIGHT...Northeast winds 5 to 15 knots backing north after midnight, then backing west late. A slight chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots becoming southwest less than 10 knots after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots becoming southwest 10 to 20 knots after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...North winds 5 to 15 knots backing west. Waves subsiding to calm to 2 feet. $$ LSZ264-221630- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 419 AM EDT Sat Jun 22 2024 .EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots backing northeast late. A slight chance of showers. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots backing northwest after midnight. A slight chance of showers. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing west. Waves subsiding to calm to 2 feet. $$ LSZ265-221630- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 419 AM EDT Sat Jun 22 2024 .EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then backing northeast late. A chance of showers. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots backing northwest late. Patchy fog through midnight. A slight chance of thunderstorms through midnight. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots veering northwest in the afternoon. A slight chance of showers. A slight chance of thunderstorms by mid afternoon. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. Showers likely and a chance of thunderstorms after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...West winds 15 to 25 knots. A chance of showers and thunderstorms. Waves calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet. $$ LSZ266-221630- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 419 AM EDT Sat Jun 22 2024 .EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots becoming northeast 10 to 20 knots late. A chance of showers. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots backing northwest late. Patchy fog. A slight chance of thunderstorms through midnight. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. A slight chance of showers through early afternoon. Waves 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Showers likely and a chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southwest winds 10 to 20 knots veering west. A chance of showers and thunderstorms. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-221630- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 419 AM EDT Sat Jun 22 2024 .EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots late. A chance of showers. Patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots backing north after midnight, then increasing to 15 to 25 knots late. Patchy fog. A slight chance of thunderstorms through midnight. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. A slight chance of showers by mid afternoon. Waves 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight. A slight chance of showers through midnight. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers after midnight. Waves building to 1 to 3 feet. .TUESDAY...South winds 15 to 25 knots becoming west 10 to 20 knots. Showers likely. A chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ261-221630- MAFOR 2209/ Superior West 11110 14120 11110 11810 11700. A chance of showers this afternoon and evening. Waves 1 to 3 feet. Superior North Central 12200 11210 12110 11100 11800 11700. Waves 1 foot or less. Superior South Central 12200 12210 12120 11810 11720. A chance of showers. Waves 1 foot or less today. Waves 1 to 3 feet tonight. Superior East 11100 13200 12110 11810 11820. A chance of showers this afternoon and tonight. Waves 1 foot or less today. Waves 2 feet or less building to 2 to 3 feet tonight. $$ Voss Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes